Probably because most devices do have hardware volume buttons. The percentage of devices that do not is probably too small to justify the effort of adding this in. The picture you provided is from a custom jellybean ROM for the Kindle Fire, which I worked on.
Unfortunately this is not the group to discuss this on. You may have better luck on android-platform since this is something that requires changes in SystemUI. -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
